j= 7x-(36x²+24x+4)
=7x-36x²-24x-4
=-36x²-17x-4
K=-16x²-[16x²-9]
=-16x²-16x²+9
=-32x²+9
L= [(6x-4)-(2x-6)][(6x-4)+(2x-6)]
= [6x-4-2x+6][6x-4+2x-6]
=(4x+2)(8x-10)
=32x²-40x+16x-20
=32x²-24x-20
M=12x²+(4x+5)²
=12x²+(16x²+40x+25)
=12x²+16x²+40x+25
=28x²+40x+25
IDENTITES REMARQUABLES:
(a+b)²=a²+b²+2ab
(a-b)² =a²-2ab+b²
(a+b)(a-b)= a²-b²
